粉质黏土图像的纹理特征分析

粉质黏土通常为絮状结构, 难以使用肉眼直接判别出颗粒的形状和大小。将现场拍摄得到的粉质黏土彩色图像转化为灰度图像，得到了灰度图像灰度直方图的6个纹理特征参数（均值、方差、平滑度、3阶矩、能量、熵）。在建立灰度共生矩阵的基础上，得到了像素平面分布关系的5个纹理特征参数（角2阶矩、对比度、相关度、逆差矩、熵）。对这些纹理特征参数与粉质黏土传统工程性质指标进行了多元线性回归分析，得到了相应回归方程。结果表明，粉质黏土图像的纹理特征参数与传统工程性质具有较好的对应关系，可以用于快速确定粉质黏土的工程性质指标，对软土地区岩土工程设计具有一定的参考价值。

Texture analysis of photographs of silty clay

Silty clay is a typical soft soil and characterized with its coagulation structure. In the field, it is very difficult to directly determine the shape and size of a grain in the silty clay by eyes. Some colorful photographs of the silty clay were captured by a commercial camera and transformed into grayscale images. To these grayscale images, the six histogram-based parameters, including mean, standard deviation, smoothness, third order moment, energy and entropy, were thereafter obtained. Considering the spatial relations of grayscale intensity in an image, five parameters, including angularity second order moment, contrast, correlation, inverse difference moment and entropy, are also obtained based on a gray co-occurrence matrix. Furthermore, the regression technique was used to estimate the relations between the texture parameters and the traditional engineering properties of silty clays. It is shown that these relations are much satisfactory and may be used in quickly examining the engineering properties of silty clay. The method developed is referable to the geotechnical design in soft grounds.